Download An Introduction to Discrete Mathematics and Formal System by D. C. Ince PDF

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Extra info for An Introduction to Discrete Mathematics and Formal System Specification

Example text

This is nearly identical to the protected access specifier used in the C++ example. The following is the Java application version of the C++ example that defines a Student class and a GradStudent class, shown previously in this chapter. As you probably suspect, there are subtle differences between the two programs. We’ll explore those differences here. The following example declares three classes. The first two class definitions are the same as in the example of the private access specifier. The third class definition is new.

Then, once the dropCourse() method has finishing doing its thing, the value returned by the dropCourse() method is assigned to the variable result using the assignment operator. The result variable is then used in the conditional expression in the if statement. A message reporting the results of the dropCourse() method is then displayed on the screen. "); } } class RegistrationForm { boolean dropCourse(int courseNumber, int studentNumber) { return true; } } Quiz 1. What is an instance variable?

Only students can use the facilities (attributes and procedures) of the students’cafeteria. Only teachers can use the facilities of the teachers’ cafeteria. However, on occasion, a friend of a teacher is permitted to eat lunch in the teachers’cafeteria, and anyone can use the facilities of the luncheonette. Java and C++ have three kinds of access specifiers—public, private, and protected. The public access specifier (the luncheonette, in this example) determines attributes and procedures that are accessible by using an instance of the class.